A transmission

Abstract

The present invention relates to a transmission. A transmission includes a differential gear train, the differential gear train includes an inner ring gear assembly, a sun gear assembly and a planetary carrier assembly connected to a planetary gear mechanism, the planetary carrier assembly includes a side plate, the side plate is combined with a gear to form two high-pressure and low-pressure volume units, and a throttling channel is connected between the two volume units; the high-pressure volume unit is constructed in the meshing area of ​​the gear, and all high-pressure volume units are interconnected and conducted through the high-pressure oil channel on the planetary carrier assembly. The present invention is further improved and optimized on the basis of the prior application, and its main advantage is that it can greatly reduce the volume of the high-pressure volume unit, thereby reducing various negative effects caused thereby, which is conducive to simplifying the structure or process and improving the transmission efficiency and reliability.

Description

Technical Field

[0001] The present invention relates to the field of transmission machinery, and more particularly to a transmission. Background Art

[0002] I have previously applied for “A Continuously Variable Transmission” on the same day, with invention numbers and utility models being 2018101117082 and 2018201977563 respectively. This invention is a further improvement and optimization based on the prior application. Summary of the invention

[0003] In view of the deficiencies or improvements of the prior application, the purpose of the present invention is to provide a transmission that can further simplify the structure or process, and especially improve the transmission efficiency and reliability.

[0004] The objective of the present invention is achieved in this way: a transmission comprises a differential gear train, the differential gear train comprises an inner ring gear assembly, a sun gear assembly and a planetary carrier assembly connected to a planetary gear mechanism, the planetary carrier assembly comprises a side plate, the side plate is combined with the gear to form two volume units of high and low pressure, a throttling channel is connected between the two volume units; the high-pressure volume unit is constructed in the meshing area of ​​the gear, and all the high-pressure volume units are interconnected and conducted through the high-pressure oil channel on the planetary carrier assembly.

[0005] On the basis of the above scheme, the present invention has the following preferred or optional schemes:

[0006] The planetary gear mechanism is connected to the planetary carrier assembly via a one-way bearing, or a one-way bearing is connected between the sun gear assembly and the planetary carrier assembly.

[0007] The differential gear train is covered with a shell, and the shell is provided with high and low pressure flow channels. The sun gear assembly is provided with a low pressure flow channel which is interconnected with the low pressure flow channel on the shell, and the high pressure oil channel on the planet carrier assembly is interconnected with the high pressure flow channel on the shell.

[0008] The planet carrier assembly is provided with a liquid outlet.

[0009] A hollow portion is provided on the side panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic cross-sectional view of a partial three-dimensional structure of an embodiment of the present invention;

[0011] Figure 2 It is a schematic diagram for auxiliary explanation of the present invention. DETAILED DESCRIPTION

[0012] In conjunction with the accompanying drawings, the embodiments of the present invention are as follows:

[0013] A transmission includes a differential gear train, which includes an inner ring gear assembly, a sun gear assembly, and a planetary carrier assembly connected to a planetary gear mechanism. The planetary carrier assembly includes a side plate, which is combined with a gear to form two high-pressure and low-pressure volume units, and a throttling channel is connected between the two volume units; the high-pressure volume unit is built in the meshing area of ​​the gear, and all high-pressure volume units are interconnected and conducted through the high-pressure oil channel on the planetary carrier assembly. Figure 1 , the inner gear ring assembly is the inner gear ring 6, the sun gear assembly is the sun gear 5 and the input shaft 1 connected or fixed thereto, the planet carrier assembly includes a side plate, a sleeve 7 and a flange shaft 12, the side plate includes a front side plate 4 and a rear side plate 10, the front side plate 4, the rear side plate 10, the sleeve 7 and the flange shaft 12 are connected and fixed to each other by screws, the inner gear ring 6 is connected to the sleeve 7 through a needle bearing, and the flange shaft 12 is used to connect the load; the planetary gear mechanism includes a planetary gear 16, and the planetary gear 16 is sleeved on the planetary gear shaft 17 through a one-way bearing, The planetary gear shaft 17 is inserted between the front side plate 4 and the rear side plate 10; the gears are the sun gear 5, the planetary gear 16 and the inner gear ring 6. When the gears are contained and wrapped in the planetary carrier assembly, the driving gear rotation can have a pump effect and a motor effect, that is, forming two high-pressure and low-pressure volume units. A throttling channel is connected between the two volume units. The throttling channel is used to connect and set a valve such as a throttle valve 14 to adjust the speed. If there is no throttle valve 14, using the internal leakage channel as the throttling channel can also have a certain automatic speed regulation capability. See Figure 2 Combination Figure 1 The high-pressure volume unit is constructed in the meshing area of ​​the gear. The meshing area refers to the area where the two gears rotate from meshing contact to meshing separation, that is, the area between the two ends of the meshing line 19 swept by the gear. At this time, the oil trapped area 20 of the gear constitutes a high-pressure volume unit; because the planetary gear 16 is meshed with the inner ring 6 and the sun gear 5 at the same time, two upper and lower high-pressure volume units will be generated. These two high-pressure volume units are connected to the end face flow channel 11 on the flange shaft 12 through the distribution port 18 on the side plate. If there are multiple planetary gears 16, all high-pressure volume units are connected to each other; except for all high-pressure volume units, all other areas with variable volumes constitute low-pressure volume units and are connected to each other.

[0014] The transmission principle of the present invention is as follows:

[0015] See also Figure 2 Combination Figure 1When the trapped oil area 20 of the gear is used to form a high-pressure volume unit, driving the sun gear 5 to rotate will generate pressure and apply it to the gears respectively, wherein the two torques Tb and Tc acting on the planetary gear 16 interfere with each other and cancel each other out, and the remaining two torques Ta and Td constitute static torques acting on the inner ring 6 and the sun gear 5 respectively. Since the torques have the same direction, a resultant torque will be generated and applied to the planetary gear shaft 17. This resultant torque will continue to be loaded on the output end, i.e., the planetary carrier assembly, as the sun gear 5 rotates continuously to form a transmission. It should be noted that the two high-pressure volume units above and below the planetary gear 16 must be under pressure at the same time to be effective, that is, the torques Tb and Tc must interfere and cancel each other out. If only one of the two high-pressure volume units is set to generate pressure, the torques Ta and Tb, or the torques Tc and Td will interfere with each other to make the transmission ineffective. This is an important reason why all high-pressure volume units need to be connected and conducted to each other. In order to achieve this purpose, the distribution port 18 on the side panel needs to be reasonably set in size, position or shape. If continuous transmission is to be formed, one solution is to make the gear overlap greater than 2, which is difficult for the externally toothed sun gear 5 and planetary gear 16, and a solution with fine and high teeth is required, but the number of teeth is large and it is not conducive to increasing oil pressure and adjusting throttling displacement. Another solution is to use multiple planetary gears 16, such as 6 or 8, and reasonably set the number of teeth so that multiple planetary gears 16 have different phases to form a relay transmission. This method can reduce the requirements for the overlap of the gears, and the volume change in the meshing area has both a shrinking and an expanding process. Using this feature, the throttling displacement can be conveniently adjusted or reduced through the distribution port 18. When the gear adopts a helical gear structure, the throttling displacement can also be adjusted by changing the helix angle or height parameters.

[0016] In the scheme of the prior application, there is a method of reducing the throttling displacement by displacement difference to improve the transmission efficiency. After further improving this scheme, the present invention greatly reduces the volume of the high-pressure volume unit and the pressure load on the parts. Let the throttling amount be Qw, the total volume of all high-pressure oil filled be V, and Qw / V be defined as the stiffness coefficient. The smaller the stiffness coefficient, the better the ability to absorb pressure or torque pulsation. However, after adjusting the throttling opening, the pressure response will become sluggish and lagging. The larger the stiffness coefficient, the opposite effect. An important disadvantage of the scheme of the prior application is that because the volume of the high-pressure volume unit is too large, the stiffness coefficient is difficult to increase, resulting in slow response. If the throttling amount is increased to improve the response, the transmission efficiency will be reduced. In addition, after the improvement of the present invention, the volume and leakage area of ​​the high-pressure volume unit are very small, and the throttling displacement can be further reduced under the condition of ensuring the stiffness coefficient. At this time, the influence of volumetric efficiency becomes limited, and the gears and side plates can be matched with clearance to reduce the process or structural requirements for parts.

[0017] The following is a description of preferred or optional solutions of the present invention:

[0018] The planetary gear mechanism is connected to the planetary carrier assembly through a one-way bearing, or a one-way bearing is connected between the sun gear assembly and the planetary carrier assembly. Figure 1 The planetary gear 16 is sleeved on the planetary gear shaft 17 through a one-way bearing. The purpose is to form a 1:1 transmission through a one-way action when the load reverses the drive input shaft 1 to rotate, so as to avoid excessive differential speed between the input end and the output end. At this time, one end of the planetary gear shaft 17 and the side plate can be matched with a conical surface and fastened with screws to prevent the planetary gear shaft 17 from rotating freely. Obviously, connecting a one-way bearing or an overrunning clutch between the sun gear assembly and the planet carrier assembly can also achieve the same purpose.

[0019] The differential gear train is covered with a housing, and the housing is provided with high and low pressure channels. The sun gear assembly is provided with a low pressure channel which is connected to the low pressure channel on the housing, and the high pressure oil channel on the planet carrier assembly is connected to the high pressure channel on the housing. Figure 1 The housing, i.e., the housing 15, is sleeved on the input shaft 1 and the flange shaft 12. The housing 15 is provided with high and low pressure channels, i.e., the high pressure channel 13 and the low pressure channel 3. The sun gear assembly includes the input shaft 1. The input shaft 1 is provided with a low pressure channel, i.e., the axial channel 2, which is connected and communicated with the low pressure channel 3 on the housing. The high pressure oil channel on the planetary carrier assembly, i.e., the end face channel 11 on the flange shaft 12, is connected and communicated with the high pressure channel 13 on the housing. The above scheme can form an external circulation oil circuit, i.e., the low pressure oil flows through the input shaft 1 and is sucked into the low pressure volume unit of the gear after cooling and filtering from the oil pool in the housing 15. The high pressure oil flows through the end face channel 11 on the flange shaft 12 and is collected into the high pressure channel 13 on the housing. After being throttled by the throttle valve 14, it falls back to the oil pool. The external circulation oil circuit can connect the throttle valve 14 to the housing 15 and control it with a motor. If there is no housing 15, the throttle valve 14 can be installed on the flange shaft 12 and manually controlled to form an internal circulation oil circuit. This scheme is suitable for occasions with relatively simple working conditions and low power transmission.

[0020] The planet carrier assembly is provided with a liquid outlet. Figure 1 The liquid outlet is the oil outlet groove 9 or the oil outlet hole provided on the front side plate 4 and the rear side plate 10. When the present invention adopts an external circulation oil circuit, the oil sucked from the oil pool can be thrown out through the liquid outlet by the centrifugal force generated by the planetary carrier assembly, so as to achieve the purpose of oil change and cooling.

[0021] The side panels have cutouts. Figure 1 The hollowed-out parts, i.e. the recessed parts 8 provided on the front side plate 4 and the rear side plate 10, can be used for low-pressure flow distribution on the one hand after the shape and position are reasonably set, and on the other hand, they are used to reduce the contact area between the side plate and the gear, especially the inner gear ring 6, or increase the side clearance, thereby reducing the mucus friction loss and improving the mechanical efficiency.

[0022] The present invention is a further improvement and optimization on the basis of the prior application, and its main advantage is that it can greatly reduce the volume of the high-pressure volume unit, thereby reducing various negative effects brought about thereby, which is conducive to simplifying the structure or process and improving the transmission efficiency and reliability.

Claims

1. A transmission, comprising a differential gear train, the differential gear train comprising an inner ring gear assembly, a sun gear assembly and a planetary carrier assembly connected to a planetary gear mechanism, the planetary carrier assembly comprising a side plate, the side plate combined with the gear to form two high-pressure and low-pressure volume units, a throttling channel connected between the two volume units, characterized in that: The high-pressure volume unit is built in the meshing area of ​​the gears. The meshing area refers to the area where the two gears rotate from meshing contact to meshing separation, that is, the area between the two ends of the meshing line swept by the gears; all high-pressure volume units are interconnected through the high-pressure oil channel on the planetary carrier assembly; the differential gear train is covered with an outer shell, and high and low pressure flow channels are arranged on the outer shell, the sun gear assembly is provided with a low pressure flow channel and is interconnected with the low pressure flow channel on the outer shell, and the high pressure oil channel on the planetary carrier assembly is connected with the high pressure flow channel on the outer shell; a hollow portion is arranged on the side panel.

2. A transmission according to claim 1, characterized in that: The planetary gear mechanism is connected to the planetary carrier assembly via a one-way bearing, or a one-way bearing is connected between the sun gear assembly and the planetary carrier assembly.

3. A transmission according to claim 1, characterized in that: The planet carrier assembly is provided with a liquid outlet.

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